While watching The Sword in the Stone for the first time in probably 20 years or longer, I was shocked to see a long sequence showing a pair of hopelessly boy-crazy squirrels chasing after Merlin and Wart in squirrel form (see here, and continued here). It's not shocking given the year it was released -- 1963, the same year that "He's So Fine" became a #1 hit. It jumped out because today a "birds and the bees" scene for children would be unthinkable -- especially the part where the little girl squirrel is giving Wart a come-hither look over her shoulder while closing him in with her luxuriantly bushy tail!
The Disney movies that I have seen, I haven't seen for awhile, so I don't remember minor scenes like this one. In other ones, have there been females this forward? I don't mean that there's merely a love story -- those squirrels are straight outta Chaucer. There was Jessica Rabbit for sure, and I vaguely recall Maid Marian being pretty hormonal, though that is a sketchy memory.
Just outside of the wild era defined by the soaring level of violence, there was Lady and the Tramp and Pocohontas, but I don't remember those females being so aggressive. There were smitten-yet-coy females within violent times, too -- Ariel, Belle, and Princess Jasmine -- but it seems like the ones who could have appeared in the Decameron only showed up during the rise of violence from 1959 to 1992 and its attendant sexual revolution.
In general, if you want to see how different things are during safe vs. dangerous times, look at children's culture. We expect the culture of adults to have some amount of sex, violence, drug use, etc., so that's not too surprising. But when it shows up even in stuff that children are taking in, that's a sure sign that the world has changed -- and similarly, when it vanishes, that the world has changed back again.